Update nightly workflow

Author: cytopia

.github/workflows/nightly.yml

@@ -36,7 +36,7 @@ jobs:
           - 'linux/arm/v6'
         refs:
           - 'master'
-          - '0.40'
+          - '0.41'
     steps:
 
       # ------------------------------------------------------------
@@ -128,7 +128,7 @@ jobs:
           - 'Nginx stable'
         refs:
           - 'master'
-          - '0.40'
+          - '0.41'
     steps:
 
       # ------------------------------------------------------------